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Your rear brake bulb wiring is connected to the high stop light, but when your problem occurs, it usually means there is a short in one of the brake bulbs (or associated connectors).
Firstly, inspect the brakelight fuse (just in case the rear lights are on a separate circuit).
Secondly, check for blown brakelight bulbs (and replace if necessary).
Thirdly, remove the bulbs and ensure they are the correct type (i.e. the bulb contacts must match the bulb holder - usually double contacts). If you have the incorrect contacts type, this will cause a short also.
Disconnect the brake pedal position switch. Did they go off? If yes, replace the switch. If no, then you probably have a bad multifuntion switch (the lever on the left side of the column). Disconnect that, if they're still on, then find the power source, there is a short somewhere.